finally robert caro, the pulitzer prize winning author of the biography of lyndon johnson. the most recent biography is called "the passage of power." i'm pleased to have all of them here as we broadcast on this inauguration day as we talk about the second term of president barack obama. i begin with robert caro. what is the challenge for presidents in a second term? >> challenge but a great opportunity when you're in the second term you have nothing more to run for, no more elections. so what you're running for a place in history and you know if you do a great job you will have a great place in history. >> rose: and you never know what's coming though, as vietnam -- >> oh, it -- as i write now, the last line about lyndon johnson, when his second term starts with passing medicare, voting rights act, civil rights act just on the triumph of getting social welfare legislation through and here comes vietnam in 1965 overshadowing it all and everything turns and as you're listening to the tapes of these conversations and you hear the despair in his -- the growing despair in his v